Melt rheology of poly (lactic acid) plasticized by epoxidized soybean oil |
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Authors: | Yuqiong Xu Min You Jinping Qu |
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Institution: | (1) Hubei Key Laboratory of Hydroelectric Machinery Design and Maintenance, China Three Gorges University, Yichang, 443002, Hubei, China;(2) National Engineering Research Center of Novel Equipment for Polymer Processing /Key Laboratory of Polymer Processing Engineering of Ministry of Education, South China University of Technology, Guangzhou, 510640, Guangdong, China |
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Abstract: | This study investigated that epoxidized soybean oil (ESO) was blended as plasticizer with poly (lactic acid) (PLA) and its
effects on the melt rheological properties, such as melt flow index, apparent shear viscosity, and melt strength of the blends.
PLA was blended by the twin-screw plastic extruder at five mass fractions: 3%, 6%, 9%, 12%, and 15% (based on PLA mass). Melt
flow index (MFI) was examined with a melt flow indexer. The results indicate that the blends of PLA/ESO had higher MFI than
pure PLA, except for MFI at 9% reaching to the lowest point, even lower than that of pure PLA. Melt rheological properties
were studied by a capillary rheometer in a temperature range of 160–180 °C. The blends ends exhibited shear-thinning behavior
and the apparent shear viscosity was well described by the power law in this shear rate region. The melt strength of PLA plasticized
with 6% ESO reached the maximums. ESO was more effective in increasing the melt strength at the mass fractions less than 6%,
which could toughen the blends to some extent. Therefore, the authors suggested the optimum addition level of 6%–9% ESO will
get good melt rheological performance balance.
Biography: XU Yuqiong (1974–), female, Ph.D., research direction: polymer composites. |
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Keywords: | poly (lactic acid) (PLA) epoxidized soybean oil melt flow index shear viscosity melt strength |
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